We know so little about this underground world, sometimes called the Hollow Earth. Some even believe it is home to superior beings, as Admiral Byrd famously recounted on his return from Antarctica in 1947. The existence of a hidden world beneath the surface has always captivated minds. Who knows, maybe this ocean actually exists, but in a different form?
In 2009, British researcher Graham Pearson, specializing in diamond formation, discovered a very particular diamond in Brazil. This diamond formed under extreme pressure and temperature conditions, at a probable depth of about 500 kilometers underground, in a transition zone of the famous Earth’s mantle (which alone makes up 82% of the planet’s volume!). Within this diamond, inclusions of a strange mineral were found: ringwoodite. It is a “hydrated mineral”, containing structurally modified water molecules. Since then, ringwoodite has been detected in various locations of the Earth’s mantle through seismic research, which could mean, according to Pearson, that “if the Earth’s mantle transition zone is composed of minerals like the one found in Brazil, which is highly probable, then there is the equivalent of two global oceans beneath our feet.”
